EPOXY RESIN FOR PREPREG, PREPREG, FIBER-REINFORCED COMPOSITE MATERIAL, AND PROCESSES FOR PRODUCING THESE

摘要

An epoxy resin composition which completely cures in a shorter time even at low temperatures than conventional epoxy resin compositions, can retain a sufficient shelf life even in storage at room temperature, and is suitable for use in prepregs. The epoxy resin composition comprises a product of the reaction of an epoxy resin with an amine compound having at least one sulfur atom per molecule, at least one amine compound having at least one sulfur atom per molecule, a urea compound, and dicyandiamide, the content of sulfur atoms and content of the urea compound in the epoxy resin composition being 0.2 to 7 wt.% and 1 to 15 wt.%, respectively.